EBC greenstuff dont need warmup. brake force is good, but the best bang-for-buck is still metal king. greenstuff lasted me around 3 months (rm299).
AXT i bought the competition disc+pads package for standard caliper. doesnt quite work from cold. needs some cycles before waking up. SENSATIONAL BRAKING! superb! will fade after 2nd guard post on genting downhill. before fading, last possible moment only brake, with high speed entry into braking zone. everytime u brake, it will make u smile. price 4 years ago: rm500. in sepang circuit, even after 5 laps, no fade. remember, these are non ventilated discs.
AXT disc will torture standard pads(mintye). around 2,3 week new brake pads will finish, and with low threshold. tekan sikit pads dah berasap.
btw, AXT n EBC are old-skool brands. now people are more interested in AFI, mintex, project mju etc etc which are more efficient.